sharepoint ECMA using a custom contentType to creating a list in SubSite

Using a custom contentType to creating a list:

function GetContentType()

{

        var clientContext = new SP.ClientContext(siteUrl);

        var currentWeb = clientContext.get_web();

        var contentTypeCollection = currentWeb.get_contentTypes();

        var contentType = contentTypeCollection.getById("0x01010038CBF7FA14024D2688184E50E84E3239");

        clientContext.load(contentType);

        clientContext.executeQueryAsync(

                                        Function.createDelegate(this, onQuerySucceeded),

                                        Function.createDelegate(this, onQueryFailed)

                            );

}

function onQuerySucceeded(){
var count = subWebs.get_count();

            if (count > 0) {

                for (var i = 0; i < count; i++) {

                    var subWeb = subWebs.itemAt(i);

                    var list = subWeb.get_lists().getByTitle("12");

                    //get this list all contentType

                    var sublistContentTypeCollection = list.get_contentTypes();

                    //if this contentType is no add this contentType;

                    sublistContentTypeCollection.addExistingContentType(contentType);

                    clientContext.load(subWeb);

                    clientContext.load(list);

                    clientContext.load(sublistContentTypeCollection);

                    clientContext.executeQueryAsync(Function.createDelegate(this, onQuerySucceededContentType), Function.createDelegate(this, onQueryFailedContentType));

                }

            }

}

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sharepoint ECMA using a custom contentType to creating a list in
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sharepoint ECMA using a custom contentType to creating a list in
SubSite